Fix image size issue

app/lib/main.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'pages/home_page.dart';
 
 void main() {
+  WidgetsFlutterBinding.ensureInitialized();
   runApp(MyApp());
 }
 

app/lib/pages/home_page.dart

@@ -89,11 +89,11 @@ class _HomePageState extends State<HomePage> {
   }
 
   Widget _buildWelcomeEditor(BuildContext context) {
-    return Column(
+    return SafeArea(
-      crossAxisAlignment: CrossAxisAlignment.stretch,
+      child: Stack(
         children: <Widget>[
-        Expanded(
+          Container(
-          child: Container(
+            height: MediaQuery.of(context).size.height * 0.88,
             color: Colors.white,
             padding: const EdgeInsets.only(left: 16.0, right: 16.0),
             child: QuillEditor(
@@ -120,13 +120,15 @@ class _HomePageState extends State<HomePage> {
                   sizeSmall: TextStyle(fontSize: 9.0)),
             ),
           ),
-        ),
           Container(
+            padding:
+                EdgeInsets.only(top: MediaQuery.of(context).size.height * 0.9),
             child: QuillToolbar.basic(
                 controller: _controller,
                 uploadFileCallback: _fakeUploadImageCallBack),
           )
         ],
+      ),
     );
   }
 

lib/widgets/FakeUi.dart

@@ -0,0 +1,4 @@
+// ignore: camel_case_types
+class platformViewRegistry {
+  static registerViewFactory(String viewId, dynamic cb) {}
+}

lib/widgets/RealUi.dart

@@ -0,0 +1,9 @@
+import 'dart:ui' as ui;
+
+// ignore: camel_case_types
+class platformViewRegistry {
+  static registerViewFactory(String viewId, dynamic cb) {
+    // ignore:undefined_prefixed_name
+    ui.platformViewRegistry.registerViewFactory(viewId, cb);
+  }
+}

lib/widgets/editor.dart

@@ -1,7 +1,6 @@
-import 'dart:html' as html;
 import 'dart:io';
 import 'dart:math' as math;
-import 'dart:ui' as ui;
+import 'dart:math' if (dart.library.html) 'dart:html' as html;
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
@@ -19,9 +18,11 @@ import 'package:flutter_quill/models/documents/nodes/line.dart';
 import 'package:flutter_quill/models/documents/nodes/node.dart';
 import 'package:flutter_quill/widgets/image.dart';
 import 'package:flutter_quill/widgets/raw_editor.dart';
+import 'package:flutter_quill/widgets/responsive_widget.dart';
 import 'package:flutter_quill/widgets/text_selection.dart';
 import 'package:url_launcher/url_launcher.dart';
 
+import 'FakeUi.dart' if (dart.library.html) 'RealUi.dart' as ui;
 import 'box.dart';
 import 'controller.dart';
 import 'cursor.dart';
@@ -79,25 +80,43 @@ abstract class RenderAbstractEditor {
 Widget _defaultEmbedBuilder(BuildContext context, leaf.Embed node) {
   switch (node.value.type) {
     case 'image':
-      if (kIsWeb) {
       String imageUrl = node.value.data;
+      return imageUrl.startsWith('http')
+          ? Image.network(imageUrl)
+          : Image.file(File(imageUrl));
+    default:
+      throw UnimplementedError(
+          'Embeddable type "${node.value.type}" is not supported by default embed '
+          'builder of QuillEditor. You must pass your own builder function to '
+          'embedBuilder property of QuillEditor or QuillField widgets.');
+  }
+}
 
+Widget _defaultEmbedBuilderWeb(BuildContext context, leaf.Embed node) {
+  switch (node.value.type) {
+    case 'image':
+      String imageUrl = node.value.data;
+      Size size = MediaQuery.of(context).size;
       ui.platformViewRegistry.registerViewFactory(
         imageUrl,
         (int viewId) => html.ImageElement()..src = imageUrl,
       );
-        return Container(
+      return Padding(
-          constraints: BoxConstraints(maxWidth: 300),
+        padding: EdgeInsets.only(
-          height: MediaQuery.of(context).size.height,
+          right: ResponsiveWidget.isMediumScreen(context)
+              ? size.width * 0.5
+              : (ResponsiveWidget.isLargeScreen(context))
+                  ? size.width * 0.75
+                  : size.width * 0.2,
+        ),
+        child: SizedBox(
+          height: MediaQuery.of(context).size.height * 0.45,
           child: HtmlElementView(
             viewType: imageUrl,
           ),
+        ),
       );
-      }
+
-      String imageUrl = node.value.data;
-      return imageUrl.startsWith('http')
-          ? Image.network(imageUrl)
-          : Image.file(File(imageUrl));
     default:
       throw UnimplementedError(
           'Embeddable type "${node.value.type}" is not supported by default embed '
@@ -144,7 +163,8 @@ class QuillEditor extends StatefulWidget {
       this.keyboardAppearance = Brightness.light,
       this.scrollPhysics,
       this.onLaunchUrl,
-      this.embedBuilder = _defaultEmbedBuilder})
+      this.embedBuilder =
+          kIsWeb ? _defaultEmbedBuilderWeb : _defaultEmbedBuilder})
       : assert(controller != null),
         assert(scrollController != null),
         assert(scrollable != null),

lib/widgets/responsive_widget.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+
+class ResponsiveWidget extends StatelessWidget {
+  final Widget largeScreen;
+  final Widget mediumScreen;
+  final Widget smallScreen;
+
+  const ResponsiveWidget({Key key, @required this.largeScreen, this.mediumScreen, this.smallScreen}) : super(key: key);
+
+  static bool isSmallScreen(BuildContext context) {
+    return MediaQuery.of(context).size.width < 800;
+  }
+
+  static bool isLargeScreen(BuildContext context) {
+    return MediaQuery.of(context).size.width > 1200;
+  }
+
+  static bool isMediumScreen(BuildContext context) {
+    return MediaQuery.of(context).size.width >= 800 && MediaQuery.of(context).size.width <= 1200;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return LayoutBuilder(
+      builder: (context, constraints) {
+        if (constraints.maxWidth > 1200) {
+          return largeScreen;
+        } else if (constraints.maxWidth <= 1200 && constraints.maxWidth >= 800) {
+          return mediumScreen ?? largeScreen;
+        } else {
+          return smallScreen ?? largeScreen;
+        }
+      },
+    );
+  }
+}

pubspec.yaml

@@ -20,6 +20,7 @@ dependencies:
   flutter_colorpicker: ^0.3.4
   image_picker: ^0.6.7+17
   photo_view: ^0.10.3
+  universal_html: ^1.2.4
 
 dev_dependencies:
   flutter_test: